It looks like a plugin/theme conflict. First of all, I would recommend you to deactivate all your plugins, and then to install or activate default theme, like TwentyNineteen or TwentySeventeen.
Do you still have your problem ? If you don’t, we have found the solution (and then activate your plugin, one by one, to see the one who creates the issue, and at the end, reactivate your theme).
Hope it helps.
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